Nut-locking device



N0. 6|6,4l9. Patented Dec. 20, I898.

A. HOWARD. v NUT LOCKING DEVICE.

(Applicatiun filed Oct. 29, 1897.) (No Model.)

PATENT OFFICE.

AUGUSTUS HOWARD, OF SAN FRANCISCO, CALIFORNIA, As-SIGNOR'T WILLARD REED GREEN,

NUT-LOCK ernciricn'rioiv forming or DENVER, COLORADO.

ING DEVICE.

partrof Letters Patent N... 6 16.419, dated December 2o, 1.89s.

A li ati and 0mm '29, 1897. Serial1l'0.65 6,852. ill'omodel.)

To (all whom it may concern.-

Be it known that I, AUGUSTUS HOWARD, a citizen of Great Britain, residing at San Francisco, county of San Francisco, and State of California, have invented certain new and useful improvements in Nut'Lockiug Devices; and I hereby declare the following to be a full, clear, and exact description of the same, reference being bad to the accompanying drawings, forming a part ofthis specification.

My invention relates to what are technically called lock-n uts"screW-nuts that are provided with a detent that prevents their coming loose under jarring action, as .in the case of fastening fish-plates on railway-bars.

My improvements consist in providing such screw-nuts with a feather or key inserted at the side in the plane of and through the screw-threads of both the nut and the bolt, acting as a key, preventing movement between the two, the key or detent being of malleable metal, capable of being upset or deflected by blows on the projecting end and formed with projections or raised portions on the outer or inner face or with recesses on the sides of the grooves in which the key is fitted, so that when the key is struckand upset it will expand and engage either the screwbolt or the nut, forming a mechanical fastening for the key, so that it cannot be withdrawn except by intention and the force of a special implement. V

The object of my invention is security from the coming loose of screw-nuts upon the moving parts of machinery or in structures of any kind subject to concussion Orjar. To this end I provide devices as illustrated in the drawings herewith, forming a part of this specification, in which Figure I 's a side elevation, partially in section, showing a bolt and screw-nut provided with my improved locking device.- Fig. is an elevation of the same bolt and nutat a right angle to Fig. I. Fig. III is an en'- largedside view of one of the keys or feathers detached. Fig. IV is a top view of the nut the drawings.

'lhe bolts 1 can be of any form or material such as is commonly employechbeing always of a malleable nature and soft enough to be screw-threaded.

The nuts 2 may be square, polygonal, or round and of 'any depth, the method of fats: tening remaining the same.

Shallow grooves 3 are formed in both the bolt 1 and the nut 2, preferably a litte deeper than the screw-thread in theboli 1, and the key 4 is inserted, as shown in Fig. I. These. keys are made to fit loosely, but to as nearly as possible fill the grooves, and are made with a hook-head 5, adapted for withdrawal by means of a crab-bar oroiher suitable imple ment. At or near the inner end are formed projections 6, as seen in Fig. III, slightly raised above the surface or face line of the key, or, what is equivalent, slight recesses are formed. in the bottom of the grooves 3 on the nut or.-

be defiectedinto these recesses, as seen at 8 in Fig. I. I

The key .4 when inserted is struck on the head and driven down at 7 against the botsection, and thus force outward the projec:

depression in the soft the bolt as the key may be turned to the right; or left, or the key will be ex'panded or bent into a recess-formed in the pit or nut, and thus guard against its withdrawal exoept byr intention and with a suitab implement.

The upsetting of the key can also be ac complished by providing a hallow recess at may bend or expand, as at S in Fig. 1, preventing it from coming on when upset by driving in the manner before described.

Having tlius'desoribedlthe nature and objects of my invention and the manner of applying the. same, what I clalim as new, and

desire to secure by Letters liatent, is-

In a nut-locking device, the combination of a bolt and a nut having correfs'rpondinggrooves to like parts throughout the several figures of tom of the groove 3, so as to upset its central the bottom of the grooves 3,1in which the key Oil bolt, so the key-4 when struck will expand-or u tions 6, which impinge u on and cause a. slight et'al of the nut or of in their adjacent faces, anda key or feather fixed my signature in the presence of two witfgrciblg ieated i engthwise therein, whgreby nesses. t e sai ey or eather is given an en wise I qpset; or expansion within the grooves to pre- AUGUSTUS HOWARD 5 vent displacement and lock the partsagainst \Vitnesses:

relative movement,substantiallyas specified. TI ZLARD REED GREEN,

In testimony whereof I hog e hereunto af- II. SANDERSON. 

